Cats effect 3.x Repl that keeps a running sum

Repl2.scala

import cats.effect.{IO, IOApp}

// Emits intro text, then prompts for integers, keeping a running sum. Will exit upon 'exit'

object Repl2 extends IOApp.Simple {

  def parseInput(input: String): Int =
    scala.util.Try(input.toInt).toOption.getOrElse(0)

  def repl(total: Int): IO[Int] = {
    for {
      input <- IO.println(s">>> total so far $total >>>") *> IO.readLine
      number <- if (input == "exit") IO.pure(total) else repl(total + parseInput(input))
    } yield number
  }

  override def run: IO[Unit] = for {
    total <- IO.print("Hello, please enter integers, and exit loop with 'exit'") *> repl(0)
    _ <- IO.println(s"total=$total")
  } yield ()
}